1. Chief, Durability and Protective Coatings Branch, National Aeronautics and Space Administration Glenn Research Center, 21000 Brookpark Rd., Cleveland, OH 44135 (corresponding author).
2. Chief, Advanced Metallics Branch, National Aeronautics and Space Administration Glenn Research Center, 21000 Brookpark Rd., Cleveland, OH 44135.
3. Senior Technologist, Structures and Materials Division, National Aeronautics and Space Administration Glenn Research Center, 21000 Brookpark Rd., Cleveland, OH 44135.